… Ecosia is a Berlin-based search engine company that reinvests more than 80 percent of its search ad revenue into tree-planting projects around the world. Currently, the company plants one tree per 50 searches. “Rather than just funneling [revenues] into endless shareholder growth, we can funnel it into tree planting and help solve climate change,” said Ruby Au, head of Ecosia North America. Since 2009, Ecosia, founded by Christian Kroll, has planted over 100 million trees. The company has 1.6 million users in the United States and 15 million users worldwide. Through search ad revenues, the company funds 38 tree-planting projects in 25 countries including Peru, Indonesia and Senegal. Trees are not donated to these countries; instead, Ecosia sets up service contract relationships with community partners who plant the trees. These partners have to meet strict tree-planting milestones based on a timeline provided by the company. Now, Ecosia is gearing up its presence in Boston.